Answers
Answer:
d=m/v d=0.94
Explanation:
^^^^^^&&&&^^^^
Related Questions
Nobel gases (inert gases) have full set of valence electrons so they DO NOT REACT with other elements. Noble gases are elements.
A. stable
B. unstable
Answers
Answer:
Noble gases are stable as they have fully filled outermost orbital. Hence they do not participate in chemical reactions.
But Xenon reacts in some cases in favourable conditions
what happens when we mix stone in water observation
Answers
Answer:
hope it's help you dear
Explanation:
If one drops a stone into a pond, a very rapid, thin jet of water spouts upwards. ... A cavity forms behind the object during impact on the water surface. This cavity is subsequently compressed by hydrostatic pressure, which leads to the formation of the jet
balanced equation for the decomposition by heating of iron(II) sulfate heptahydrate
Answers
The balanced equation for the decomposition by heating of iron(II) sulfate heptahydrate is FeSO₄.7H₂O —> FeSO₄ + 7H₂O.
What is a balanced equation?An equation for a chemical reaction is said to be balanced if both the reactants and the products have the same number of atoms and the total charge for each component of the reaction. In other words, both sides of the reaction have an equal balance of mass and charge.
Here, in the equation FeSO₄.7H₂O —> FeSO₄ + 7H₂O
There is one molecule of iron is given on both sides and seven molecules of water given on both sides. So this equation is balanced. When there are similar molecules present on both sides. If the count on both sides is equal then this is called a balanced equation.
Thus, the balanced equation is FeSO₄.7H₂O —> FeSO₄ + 7H₂O.
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Which of the following is a feature of a Type IV flotation device?
Answers
Answer:
A Type IV PFD is an approved device designed to be thrown to a person in the water. It is not designed to be worn. It is designed to have at least 16.5 pounds of buoyancy. The most com- mon Type IV PFD is a buoyant cushion.
You are going to heat up some soup. The first thing you need to do is turn off the natural-gas (methane) stove. When you ignite a natural-gas stove, methane (CH4) reacts with oxygen (O2) to produce carbon dioxide (CO2) and water vapor (H2O).
Required:
a. Write a balanced equation for this reaction. Be sure to show your work.
b. What type of reaction is this? Describe the common reactants and products for this type of reaction.
Answers
Answer:
CH4 + 2O2 --> CO2 2H2O, Combustion Reaction
Explanation:
1044.987 Rounded to three significant figures
Answers
Answer: 1040 or 1.04 × 103
Explanation:
Depending on if you need to write it in scientific notation.
Hope this helps!
what is the formula of water
Answers
Answer:
H2O is the formula of water
Answer:
H²O is formula of water
Explanation:
2 molecule of hydrogen and 1 molecule of oxygen
How did Mendeleev come up with the first periodic table of the elements? (1 point)
A He determined the mass of atoms of each element.
B He estimated the number of electrons in atoms of each element.
C He arranged the elements by different properties to find a pattern.
D He organized the elements by their atomic number.
Answers
Mendeleeve's periodic table was based on the atomic mass of each element.
The correct answer is option A: He determined the mass of atoms of each element.
The periodic table can be described as a regular arrangement of elements based on some periodic properties. The periodic table has evolved through the ages. Its patter has been changed several times before it arrived at its present form.
The Mendeleev periodic table was based on the mass of atoms of the elements. This table was published in Russia in 1869. His table even predicted elements that were yet to be discovered.
Learn more: https://brainly.com/question/7373020
Answer:
1. He arrange the elements by different properties to find a pattern!
Here are the rest!
2.. atoms are indivisible
3. He determined the amount of charge on an electron
4. Like charges repel and opposite charges attract
5.Alpha particle deflection
Hope this helps the ballers!
Rocephin® is an antibiotic sometimes used to treat skin infections. In children, the maximum recommended daily dose of this medicine is 75 mg/kg of body mass. Express this dosage in g/lb, using the conversion 1 kg=2.20 lb.
Answers
A daily dose of 75 mg/kg of body mass of Rocephin® is equivalent to 0.034 g/lb of body mass.
In children, the maximum recommended daily dose of this medicine is 75 mg/kg of body mass. First, we will convert this dose to g/kg of body mass using the conversion factor 1 g = 1000 mg.
[tex]\frac{75 mg\ Rocephin}{kg\ body\ mass} \times \frac{1 g\ Rocephin}{1000 mg\ Rocephin} = \frac{0.075 g\ Rocephin }{kg\ body\ mass}[/tex]
Then, we will convert the dose of 0.075 g of Rocephin/kg of body mass to g of Rocephin/lb of body mass using the conversion factor 1 kg = 2.20 lb.
[tex]\frac{0.075 g\ Rocephin }{kg\ body\ mass} \times \frac{1kg\ body\ mass}{2.20lb\ body\ mass} = \frac{0.034 g Rocephin}{lb\ body mass}[/tex]
A daily dose of 75 mg/kg of body mass of Rocephin® is equivalent to 0.034 g/lb of body mass.
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Which of the following atoms is expected to have two unpaired electrons?
Al
Mg
Na
None of the above
Answers
Answer:
none of the above answers
A major component of gasoline is octane . When octane is burned in air, it chemically reacts with oxygen gas to produce carbon dioxide and water . What mass of octane is consumed by the reaction of of oxygen gas
Answers
Which substance is an element that is composed of molecules?
A. water (H2O)
B. methane (CH4)
C. hydrogen (H2)
D. helium (He)
Answers
Answer:
the answer is hydrogen which is B
The substance is an element that is considerably composed of molecules known as hydrogen (H2). Thus, the correct option for this question is C.
What is a Chemical element?A chemical element may be defined as a species of an atom that remarkably bears a specific number of sub-atomic particles in its structure. These elements are not further decomposed into smaller components in a chemical reaction.
H2 is also known as molecular hydrogen. It forms when two hydrogen atoms are significantly bonded to one another in order to give rise to a molecule. Water is not an element, it is a molecule. While methane is a chemical compound that possesses a chemical formula CH4. Helium (He) is a chemical element only.
Therefore, hydrogen is an element that is composed of molecules. Thus, the correct option for this question is C.
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How many inches are in 1.00 km
Answers
39370.079 inches
A bike lost 20% of its value after the first year, its value after the first year is $1039. Calculate the original price of the bike?
Answers
Answer:
$1246.90
Explanation:
Since the bike lost [tex]20%[/tex]% of it's value and it now currently at $[tex]$1039[/tex], we have to do 20% * $1039 to find the amount of money lost. 20%*1039=207.8. We have to add it up to find the original value so 1039+207.8=$1246.8
You are unable to lift an object. Which property makes the object difficult to lift?(1 point)
mass
density
weight
volume
Answers
Answer:
You are unable to lift an object. Which property makes the object difficult to lift?(1 point)
weight
What is the SI unit for energy? How is it abbreviated?
Answers
Answer:
Joule - J
Explanation:
As energy is defined via work, the SI unit of energy is the same as the unit of work – the joule (J).
which is the best interpretation of the two flat portions of the graph
A. These show where kinetic energy is increased
B. These show where temperature is at 0 Celsius
C. These show where thermal energy does not exist
D. These show were changes of state are occurring
Answers
Answer:
b
Explanation:
Which of the following is an example of quantization?
A. The distance the ball is passed
O B. The fans sitting in the bleachers
C. The coach pacing the floor
O-D. The movement of basketball players on a court
Answers
Explanation: the distance a ball is passed isn’t mapping something out nor are fans sitting and a coach pacing the floor is a back and fourth movement as basketball players are moving continuously mapping out little patterns.
The correct option is D The movement of basketball players on a court.
What is basketball ?Basketball exists as a team sport in which two teams, most generally of five players each, opposing one another on a rectangular court, contest with the primary objective of shooting a basketball (approximately 9.4 inches (24 cm) in diameter) through the defender's hoop (a basket 18 inches (46 cm) in diameter mounted 10 feet (3.048 m) high to a backboard at each end of the court, while controlling the opposite team from shooting through their hoop. A field goal stands worth two points unless made from behind the three-point line when it stands worth three. After a foul, timed play stops and the player fouled or selected to shoot a technical foul is assigned one, two, or three one-point free throws. The team with the most points at the end of the game wins, but if regulation play passes with the score tied, an additional period of play (overtime) exists mandated.
Hence, The correct option is D The movement of basketball players on a court.
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In a year an adult cow produces around 3.571 x 10^27 molecules of methane CH4 a greenhouse gas how many moles of methane does this cow produce in a year
Answers
Answer:
[tex]\boxed{\boxed {\sf 5930.0 \ mol \ CH_4}}[/tex]
Explanation:
We are asked to find how many moles of methane (CH₄) a cow produces in a year. We must convert molecules of methane to moles of methane. We will do this using Avogadro's Number or 6.022 × 10²³. This is the number of particles (atoms, molecules, formula units, etc.) in 1 mole of a substance.
In this case, the particles are molecules of methane. There are 6.022 × 10²³ molecules of methane in 1 mole.
We will convert molecules to moles using dimensional analysis. Set up a ratio using Avogadro's Number.
[tex]\frac {6.022 \times 10^{23} \ molecules \ CH_4}{ 1 \ mol \ CH_4}[/tex]
We are converting 3.571 × 10²⁷ molecules of methane to moles, so we multiply the ratio by this value.
[tex]3.571 \times 10^ {27} \ molecules \ CH_4 *\frac {6.022 \times 10^{23} \ molecules \ CH_4}{ 1 \ mol \ CH_4}[/tex]
Flip the ratio. It is still the same value, but the units of molecules of methane cancel.
[tex]3.571 \times 10^ {27} \ molecules \ CH_4 *\frac { 1 \ mol \ CH_4}{6.022 \times 10^{23} \ molecules \ CH_4}[/tex]
[tex]3.571 \times 10^ {27} *\frac { 1 \ mol \ CH_4}{6.022 \times 10^{23} }[/tex]
[tex]\frac {3.571 \times 10^ {27}}{6.022 \times 10^{23} } \ mol \ CH_4[/tex]
[tex]5929.923613 \ mol \ CH_4[/tex]
The original measurement of molecules of methane( 3.571 × 10²⁷ molecules) has 4 significant figures, so our answer must have the same. For the number we calculated, that is the ones place. The 9 in the tenth place tells us to round the 9 in the ones place up to a 0, then the 2 in the tens place up to a 3.
[tex]5930 \ mol \ CH_4[/tex]
We must add a placeholder zero in the tenth place to reach 4 sig figs.
[tex]5930.0 \ mol \ CH_4[/tex]
The adult cow produces approximately 5930.0 moles of methane in a year.
Explain why there was a reaction between zinc metal and a salt solution of copper sulphate please help me
Answers
Answer:
When zinc is added to copper sulphate (CUSO4) solution due to more reactivity of zinc, cooper is replaced by the zinc and forms zinc sulphate. During the process, the colour of the solution changes from blue to colourless.
Which isotope of iron from the periodic table is most abundant
Answers
Answer:
Iron has four naturally-occurring stable isotopes, 54Fe, 56Fe, 57Fe and 58Fe. The relative abundances of the Fe isotopes in nature are approximately 54Fe (5.8%), 56Fe (91.7%), 57Fe (2.2%) and 58Fe (0.3%).
In order for a wave to be affected by a polarized lens, it must be a
a. Transverse wave
b. Longitudinal wave
c. Surface wave
d. Electromagnetic wave
Answers
Answer:
the answer is transverse wave
What is the volume of 12.0 gof a liquid with a density of 1.37 g/mL?
Answers
I need help on this question plzzz
Answers
Answer:
76 ml
0.076 L
Explanation:
hope that helps
Answer:
76 for the first one at least I think
If you know the atomic number of an element, what information does it give you about neutral atoms of that element?
Answers
Answer:
electrons
Explanation:
the atomic number tells you the number of Drotons in one atom of an element.It also tells you the number of electrons in a neutral atom of that element. The atomic number gives the "identity" of an element as well as its location on the periodic table.
plz help!!
fill in the blank
Answers
Answer:
0.0325m = 3.25 cm
Explanation:
1m = 10-²cm
Answer:
3.25cm
Explanation:
a centimeter is just 1/100 of a meter
which atom can gain electrons lose electrons and how many ? if sodium is -2,8,1/and chlorine is -2,8,7
Answers
Answer:
A sodium atom can lose its outer electron. It will still have 11 positive protons but only 10 negative electrons. So, the overall charge is +1.
A carboxylic acid is an organic acid based on the carboxylate functional group, −COO−−COO−. The pKa of acetic acid, CH3COOHCH3COOH, is 4.80. The pKa of chloroacetic acid, CH2ClCOOHCH2ClCOOH, is 2.99. The pKa of trichloroacetic acid, CCl3COOHCCl3COOH, is 0.79 Acetic acid diluted in water is known as vinegar, which is safe for many food, cleaning, and alternative health applications. The other two acids are quite hazardous to our health in addition to being stronger acids, and their reactivity makes them useful as reagents in organic synthesis. Let us consider what accounts for the increased acidity and how to test those hypotheses.
Consider what trend exists in the pKapKa values for these three carboxylic acids based on their molecular formulas, then complete the following statement regarding a trend that relates to this phenomenon.
The pKa values of the carboxylic acids tend to decrease as the ___ increases.
Answers
Consider what trend exists in the pKapKa values for these three carboxylic acids based on their molecular formulas, then complete the following statement regarding a trend that relates to this phenomenon.
The pKa values of the carboxylic acids tend to decrease as the ___ increases.
6. Heat from the sun reaches to us by
(a) radiation
(b) conduction
(c) convection
(d) all of these
PS. the one who gets it correct will be followed by me and also be marked as the brainliest!
Answers
Answer:
radiation
....
.
.
.
.hi how r u
Is my answer correct
Answer:
Radiation
Explanation:
Heat from the sun reaches is by the process of radiation
22. Which of the following is contained only in a eukaryotic cell? A. cell wall
B. nucleus
C. chromosomes
23.Which of the following terms represent the chemical reactions to break down food into simpler compounds in an organism?
A. anabolism
B. catabolism
C. nitrogen cycle
24.What types of molecules are bonded together to form a nucleotide? A. 2 nitrogen bases + 1 sugar
B. 2 sugars + 1 phosphate group
C. 1 nitrogen base + 1 phosphate group + 1 sugar
25.Glucose and oxygen are the two products of photosynthesis A. true
B. false
26.What is the first step in the refining of petroleum? A. cracking
B. drilling
C. distillation
27.When radium-226 (atomic number 88) decays by emitting an alpha particle, it becomes _________.
A. polonium-222 B. polonium-224 C. radon-222
28.The general name for hydrocarbons with at least one triple covalent bond is _________.
A. alkenes B. alkanes C. alkynes
29.What particle is emitted in alpha radiation? A. electron
B. photon
C. helium nucleus
30.Which type of compound is this? CH3CH2CH2CH2OH
A. alcohol B. aldehyde C. ether
31.Why are the molecules of hydrocarbons nonpolar? A. The intermolecular attractions are strong.
B. All the bonds are single covalent bonds.
C. The electron pair is shared almost equally in all the bonds.
32. An amino group and a carboxyl group are joined by a ___________ bond. A. peptide
B. protein
C. amino
33.What type of radiation is likely to occur when the ratio of protons to neutrons is below the band of stability?
A. alpha decay
B. beta decay
C. neutron emission
34.Covalent bonds are between bases in a DNA base-pair. A. true
B. false
35.What is the name of the functional group in the following compound? R—NH2
A. halogen B. amine C. ether
Answers
Answer:
22 options A cell wall
23 options A anabolism
24 options B 2sugar + 1phosphate group